brothers



No. 752,819. PATBNTED FEB. 23 190 S; W. BROTHERS.

ROCK DRILLING MACHINE.

APPLICATION FILED FEB. 24. 1903.

$10 MODEL.

4 SHEETS-SHEET 1.

Noi.'752-,819.

PATENTED FEB. 23, 1904.

S. W. BROTHERS. ROCK DRILLING MACHINE.

APPLICATION FILED FEB. 24. 1903.

4 SHEETS-SHEET 2.

NO MODEL.

PATENTED FEB. 23, 1904.-

4 SHEETS-SHEET 3.

s. w. BROTHERS. ROCK DRILLING MACHINE.

APPLICATION FILED FEB. 24. 1903.

N0 MODEL.

PATENTED FEB. 23, 1904'. s. W. BROTHERS.

ROCK DRILLING MACHINE.

APPLICATION FILED PEB 24. 1903.

H0 MODEL.

4 SHBETS-SHBET 4.

To all whom it may concern.-

UNITED STATES Patented February 23, 1904.

PATENT OFFICE.

SANFORD W. BROTHERS, DENVER, COLORADO.

ROCK-DRILLING MAQHINE.

P IFI T forming part of Letters Patent No. 752,819, dated February 23, 1904.

Application filed February 24, 1903. Serial 1101144.,889. (No model.) V

Be it known that I, SANFORD Bno'rnnns, a l citizen of the United States of America, residing in the city and county of Denver and State- I of Oolorado,have invented certain new and useful Improvements in Rock-Drilling Machines; and I do declare the following to be a full, clear, and exact description of the invention, such. as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying draw- 'will be fully understood by reference to the accompanying drawings, in which is illustrated an embodiment thereof.

In the drawings, Flgure 11s a vertical longitudinal section taken through my improved machine, the reciprocating parts being shown Fig. 8.

r the line 5 5, Fig. 2, thepiston being removed.

Figs. 6,

lines 6 6, 7 7 and 8 8, respectively, of Fig. 5

7, and 8 are sections taken on the viewed in the direction of the arrows. Fig. 9 is a section taken on the line 9 9, Fig. 7. Fig. 10 is a section taken on the line 10 10, Fig. 11 is a section taken on the line 11 11, Fig. 1. Figs. 12 and 13 are detail views of the key for locking the drill-bit or steel in place in the shank. These views are taken at right angles to each other.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate the guide-shell,

upon which is slidably mounted the casing 6,

which is moved back and forth on the shell by means of a feed-screw 7, journaled at Sand threaded in a depending nut 9, mounted on the casing in the usual manner. Located within the cylindrical chamber of the casing is a j of the drawings.

1 referring to Fig. 11 of the drawings.

reciprocating piston 10, into which is screwed from the rear a nut 12, interlorly grooved to engage a riflie-bar 13, whose rear extremity is provided with a head 14, located in a chamber formed in the cap 15, screwed into the rear extremity of the casing. This head 14. carries two dogs or pawls 16, engaged by springs17, adapted to. press them outwardly.

Into the head or cap 15 from the inside is screwed by a left-hand thread a ratchet-bushing 18, whose teeth are engaged by the dogs 13, which lock the rifiie-bar against rotation in one directionnamely, toward the left, as indicated by the arrow, referring to Fig. 11 By reason of the left-hand thread of the ratchet-bushing the latter is prevented from unscrewing from the cap during the strain or pressure thereon incident to the rearward movement of the piston, whose tendency would be to turn the rifiie-bar toward the left, referring to Fig. 11; but as the dogs lock the rifiie-bar from turning in this direction the piston, together with the chuck connected therewith, as hereinafter explained,

is compelled to rotate toward the right, still During the forward movement of the piston, however, the rifile-bar is free to rotate in the head and the piston moves forwardlywithout any rotary movement, as will be readily understood.

In front of the head 14 of the riffie-bar is located a sleeve 19, which is locked in place by a washer 20, engaging a shoulder 21 on the casing in front of the washer. A rubber cushion or buffer 22 surrounds the riflfle-bar, engages the sleeve 19 in the rear and the washer 20 in front, the latter holding the buffer in position. This buffer protrudes forwardly through the washer, whereby. it is adapted to engage the piston during the rearward stroke of the latter. The forward portion 10 of the piston is reduced or made smaller than its body part. This reduced portion is fitted into a collar 23 of a bushing 23, the latter being fitted into the forward portion of the casing and engaging a shoulder 24 thereon, located in the rear of the collar and locking the bushing against rearward movement. This bushing is locked in place from the front by a sleeve 25, screwed into the front end of the from slipping out of the chuck.

the U-shaped key is bifurcated, as shown at casing. This sleeve is thicker than the bushing and forms a stop in front for a rubber buffer 26, whose rear extremity engages a shoulder 27 formed on the rear end of the chuck 27. This chuck is hollow and is entered from the rear by the reduced portion 10 of the piston and from the front by the drill, steel tool, or bit 28.

The drill-bit is locked in the chuck by a U- shaped key 29, inserted in slots 27*, formed in the forward extremity of the chuck and engaging recess 28, formed in the opposite sides of the bit, whereby the latter is prevented Each arm of 29, (see Fig. 13,) and the key is so arranged that these arms form a yielding stop to the ,bit' when the latter has reached the forward limit of the movement allowed by its key en- These recesses 28 are of greater length than the width of the key to allow the drill-bit a normal working movement without moving the chuck longitudinally. When the cutting extremity of the bit is 'pressed against the rock, the recesses 28 extend rearwardly from the key, (see Fig. 2,) whereby the bit is allowed a predetermined forward movement without striking the key, which movement is sufficient for ordinary purposesthat is to say, when cutting rock of uniform hardness. If, however, the bit vstrikes a soft spot in the rock, the piston or hammer will drive it abnormally forward,

bringing the shoulders at the rear extremities 4o I aforesaid.

of the recesses 28 into contact with the key,

. which yields by virtue of its bifurcated arms and prevents injury to the mechanism by This shock is furwhich the shoulder 27 of the chuck bears, as

Located within the chuck and fitting over 3' the rear extremity of the bit is a cup-shaped cap 30, upon which the forward extremity of the piston-hammer strikes or impinges in delivering its blows to the bit during the operation of the machine. This blow-receiving cap enters an interior annular recess formed in the chuck, and in this recess forward of the cap is located a rubber. buffer 31. Normally or when the drill-bit is at its rearward limit of movement there isa space'between the cap 30 and the buffer 31; but this space is of less width than the space in the rear of the key 29.

Hence the cap will strike the bufler 31 before :the drill-bit strikes the key. It will therefore be understood that the buffer 31 and the yielding key 29 cooperate to cushion the blows of I the hammer-piston.

The manner of connecting thechuck with the piston, whereby as the latter is rotated by virtue of its engagement with the rifHe-bar a corresponding movement will be imparted to the chuck and drill-bit, will now be described. This chuck is slotted, as shown at 27 exteriorly grooved, as shown at 27, and interiorly grooved, as shown at 27 on opposite sides to form ways or seats for keys 32, each of which is provided with shoulders 32, 32, and 32. The shoulder 32, which is foremost, engages the shoulder of the chuck forward of the slot 27 and projects inwardly to engagement with the rear extremity of the cap 30, whereby the latter is held in place when the parts are assembled. The shoulder 32, which is intermediate the other two shoulders, engages the collar of the chuck in front, while the shoulder 32 which is rearmost, engages the front face of the collar 23 of the bushing 23 when the mechanism is assembled. The rear extremities 32 of the keys project beyond the chuck. These keys also engage grooves 10, formed in the opposite sides of the reduced portion 10 of the piston, whereby the chuck and piston are interlocked and caused to rotate in unison, while the piston is allowed to reciprocate without destroying this interlocking relation.

The sleeve 25 is provided at its forward extremity with a shoulder 25, which engages the front end of the casing. Into this front end of the sleeve 25 is screwed a housing 33, whose forward extremity is interiorly threaded to receive a sleeve 34, which is screwed thereinto. Into this sleeve 34 is screwed the rear extremity of a tube 35, which surrounds the drill-bit and closes the longitudinal grooves of the bit exteriorly, forming ways for water or air introduced by way of registering openings A and B, formed in the casing and sleeve 25 and flowing through the housing 33 to the grooves of the bit for the purpose of cleaning out the hole in the rock or removing the chippings or cuttings formed therein during the drilling operation.

The central portion of the enlarged or body. part of the piston is provided with a circumferential recess C, communicating alternately with the short passages D and E, leading from the opp'osite'extremities of the chamber F of the reciprocating slide-valve G. This valve consists of a stem provided with four separated disks or enlargements which fit the walls of the valve-chamber. These disks are designated Gr, G G and G, respectively. The fluid for operating the piston is introduced by way of a portH and passes between the disks G and Gr of the slide-valve and passes thence through the passage I into the space between" the disks G and Gr and thence through the passage J to the exhaust-port K. As soon as the piston has moved rearwardly far enough to uncover the passage D the fluid flows to the forward extremity of the valve-chamber and drives the valve rearwardly, cutting off the passage I from the inlet-port H and opening communication between the passage I and the inlet-port. At the same time communication is opened between the passage I and the exhaust-passage J and closed between the passage I and the exhaust-passage J. As soon as this occurs the piston begins its forward movement. The exhaust from the extremities of the valve-chamber after entering the groove G escapes to the exhaust-port K by way of a port L.

The extremities of the slide-valve chamber are closed by screw-plugs M, whose inner extremities are provided with caps M, which catch the air and cushion the valve as it reaches its limit of movement in both directions.

From the foregoing description the use and operation of my improved drill will be readily understood. As the piston, reciprocates by virtue of the action of the fluid thereon, as heretofore explained, blows are delivered in rapid succession upon the cap 30, covering the rear extremity of the drill-bit, whereby the forward extremity of the latter is made to perform the rock-cutting function. During each rearward movement of the piston the engagement of its nut 12 with the rifHe-bar gives the piston a partial rotary movement, which is communicated to the chuck and drillbit by virtue of the interlocking relation existing between the piston and chuck.

Attention is called to the fact that the tube .35 is connected with the casing throughthe instrumentality of the two parts 33and 34:,

tened to-the part 34 in any suitable manner,

whereby the two parts rotate together or act in unison. When it is desired to gain access to the fastening device 29, the "part 34:, together with the tube 35, is detached from the part 33 by turning the parts 35 and 34 toward the left, whereby they move inwardly toward the chuck. The part 33 is then turned in the same direction, whereby it is caused to move outwardly from the part 25 until detached. The part 33 may then be slipped down ovcr the tube 35, giving the operator access to the fastening device 29 for the purpose stated. It may be assumed that the tube 35 extends to the cutting-head of the bit, in which event the tube cannot be moved toward the cuttinghead for the purpose of detaching the parts. Hence the necessity of the double coupling or the housing connection between the tube and the casing, whereby the housing is detachabl y connected with the casing and the tube detachably connected with the housing Having thus described my invention, what I claim is 1. In a rock-drilling machine, the combinationwith the casing and a reciprocating piston therein, of a drill-holding chuck, and means for connecting the piston and chuck whereby they rotate together, but have independent longitudinal movement, said means comprising detachable keys mounted in seats formed in the chuck and engaging seats or grooves formed in the piston.

2. The combination with the casing, of a reciprocating piston, means for rotating the same, a drill holding chuck, and detachable keys connecting the chuck and piston causing them to rotate in unison, while allowing the two parts independent movement longitudinally.

3. The combination with the casing and drillbit, of a hollow chuck open at both ends to receive the drill-bit and piston, respectively, a reciprocating piston entering the chuck from the rear and adapted to act on the drill-bit, and detachable longitudinally-disposed interlocking keys engaging seats formed in the adjacent parts of the chuck and piston, whereby the two parts are allowed independent longitudinal movement but caused to rotate in unison.

4:. The combination with the casing, of a reciprocating piston having a reduced for ward portion, a chuck open i n the rear to receive the reduced part of the piston, the chuck being slotted to form a key-seat, and a detachable longitudinallydisposed key located in said seat, said key extending rearwardly from the chuck and engaging a longitudinal groove formed in the reduced part of the piston where'- bythe latter is allowed to reciprocate independently of the chuck, while the two keyconnected parts are caused to rotate in unison.

5. The combination with a suitable casing and drill-bit, of a hollow open-ended chuck revolubly mounted in the casing, locked against rearward movement, and yieldingly retained in front, the drill-bit being inserted in the forward extremity of said chuck and secured to have a limited independent movement, and a reciprocating piston having a reduced forward extremity entering the chuck from the rear and acting on the drill-bit, and means for interlocking the piston and chuck to cause them to rotate in unison while they are allowed independent longitudinal movement, said means comprising detachable keys mounted in the chuck, extending rearwardly therefrom and engaging counterpart seats or groovesformed in the piston.

6. The combination with the casing, of a bushing located in its forward portion, the said bushing engaging a shoulder on the casing for locking the bushing against rearward movement, a sleeve inserted in the forward extremity of the casing for locking the bushing against forward movement, the rear extremity of the bushing having an interiorly-projecting collar, a hollow open chuck inserted in the front end of the casing and whose rear extremity is provided with a collar engaging the interiorly-projecting collar of'the bushing, an elastic bufier surrounding the chuck within the bushing and located between the chuckcollar and the rear extremity of the sleeve, and a cap applied to the rear extremity of the drill-bit and occupying a counterbore formed in the chuck, the capv being arranged to receive the blows of the piston-hammer.

7. The combination with a casing, a drillbit and a piston-hammer, of a drill-chuck open in front to receive the drill-bit and in the rear to receive the piston-hammer, and a cap applied to the rear extremity of the drill-bit and located in a counterbore formed in the chuck and relatively movable in the chuck.

8. The combination with the drill-bit, of an openended chuck adapted to receive the drillbit in front, of means for connecting the drillbit with the chuck to allow the bit a limited longitudinal movement, a cap located in the chuck and engaging the rear extremity of the drill-bit, a yielding buffer surrounding the drill-bit forward of the cap and engaging an interior shoulder formed around the chuck, and means connected with the chuck for locking the cap against rearward movement.

9. The combination with a drill-bit, of an opensended chuck, means for locking the drillbit in the chuck, and a loose cap located in the chuck and engaging the rear extremity of the drill-bit.

10. The combination with a drill-bit, of a chuck adapted to receive and hold'the drillbit, the latter being allowed a limited independent movement, an annular recess formed in the. chuck around the drill-bit, a yielding buffer located in said recess, and a relatively movable cap located in the chuck and covering the rear extremity of the drill-bit, the said cap being located in the rear of the buffer and adapted to engage the latter before the drillbit has reached the limit of independent movement permitted by the chuck.

11. The combination with a drill-bit and chuck, of a U-shaped device adapted to secure the drill-bit in the chuck, the latter having transverse slots to receive the arms of said device, and the drill-bit having recesses formed in its opposite sides, which recesses the arms of the fastening device engage, the arms of said device being constructed to yield when engaged by the rear shoulders of the recesses in the bit.

12. The combination with a drill-bi}. and

chuck, of a U-shaped fastening device, having bifurcated arms to cause the said arms to yield, the drill-bit having recesses in its opposite sides, the chuck having openings to receive the arms of the folding device, which arms engage the recesses of the drill-bit, thelength of the recesses being greater than the width of the arms located in the chuck and applied tothe rear extremity of the drill-bit, and a bufier located in the chuck forward, of said cap, the latter being arranged-to engage the cap before the rear shoulders of the recesses engage the said arms of the fastening device.

13. A U-shaped device for fastening a drillbit into its chuck, the arms of said device being bifurcated to cause them to yield for the purpose set forth.

14C. The combination with the casing, the drill-bit and chuck, of means for connecting the drill-bit and chuck, a tube surrounding the bit, and a coupling interposed between the tube and casing and surrounding the means for connecting the drill-bit and chuck, one extremity of the coupling being detachably connected with the casing and the other extremity of the coupling detachably connected with the tube.

15. The combination with the casing and drill-bit, a chuck, and means for connecting the drill-bit with the chuck, of a tubular covering surrounding the bit, and a housing de-, tachably connected with the casing and surrounding the means for connecting the chuck anddrill-bit, the tubular cover being detachably connected with the housing.

16. The combination with the'casing, the drill-bit, a tube surrounding the bit, a chuck, and means for connecting the drill-bit with the chuck, of a housing interposed between the tube and the casing,detachably connected with both and surrounding the means for connecting the drill-bit with the chuck.

17. In a rock-drilling machine, the combination with the casing, a tool-holder located in the casing and projecting therefrom, a tool or bit connected with the holder, and a tube surrounding the bit, of a housing interposed between the tube and casing and detachably connected with both, the said housing surrounding the portion of the tool-holder where the connection is made with the tool.

18. In a rock-drilling machine, the combination with the casing, a chuck located therein and projecting therefrom, a drill-bit, a detachable fastener connecting the bit with the chuck, and a tube surrounding the bit, of a housing interposed between the tube and casing and detachably connected with both by means of right and left screw-threads.

In testimony whereof I affix my signature in presence of two witnesses.

SANFORD W. BROTHERS.

Witnesses:

A. J. OBRIEN, DENA NELsoN. 

